2007 Buick Lucerne cabin filter

Raise the hood and you can see an access panel between the bottom of the windshield and the firewall on the passenger side. It's maybe 10 inches wide. Press the two tabs in and pull up on the panel to remove it. Reach into the hole and remove the old filter, noting how it is folded and placed in position. Fold the new filter and insert it back the way the old filter was. Replace the access panel and close the hood.